Improvement in steam engines



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EDWIN GARFIELD, 0F HARTFORD, CONNECTICUT. i Letters Patent No. 71,159, dated November 19, 1867.

IMPROVEMENT IN STEAM ENGINES.

fthe .rigshnle referat tu in there listers Mint mit mrtinggurt nf tte time.

T0 ALL WHOM IT MAY CONCERN:

Be itknown that I, EDWIN GARFIELD, of the city and county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in theMode of Exhausting Steam from Steam Engines; and to enable others' skilled in the art to 'make and use it, I will proceed to describe, by referring' to the drawings, in

which the same letters indicate like parts in each of the gures.

The nature of this'invention will be understood from the follow-ing:

It consists of a device, by the use of which, in connection with the exhaust-passage of a steam-cylinder, the exhaust steam can be discharged through two distinct passages or pipes into the open air, tl1 e smoke'stack, into 'the water-tank, or condenser.

-The object desired to be attained thereby is to place the exhaust-passage of a steam-cylinder in connection with adevice whereby said passagcis rendered changeable from-one direction to the other, and p eri'ectly under' the control of the engineer, so that if he be running his engine through a portion of a city whose laws prohibit him from exhausting steam into the smoke-stack or 4open air, the engineer, on reaching the contines of the city, can instantly change the valve from one port to the other, and thereby change the exhaust steam, which/has. been passing into the smoke-stack or into the open air, through one passage, so that it will pass through the other passage into a condenser or water-tank without stopping the engine. In the accompanying drawings Figure 1 is asection view of a valve, which has a double-exhaust passage, a a', from` the main exhaust d from the steam-cylinder, one'branch of which conducts the steam into the smoke-stack in the common way, and the other conducts it into a condenser or water-tank. One of these passages can always be kept closed by the. valve b, which is or may be operated by a lever acting upon the valve-rod c. This valve-chamber may be made either round or square. Thus, a non-condensing engine can be changed into a condensing engine, or a condensing engine into a non-condensing engine.

The principle as applied to locomotive engines is equally applicable to a. stationary engine; and it is particularly valuable in such cases as where it is desirable to use the exhaust steam for steaming or heating purposes.

I believe I have thus shown the nature, construction, and. advantage of this improvement so as 'to enable others skilled in the art to make and use the same therefrom.

What I claim, therefore, and desire to secure b y Letters Patent, is-

The valve 6, in combination with the double exhaustpassage a a' and the steam-exhaust port d, substantially as and for `the purpose described. v

EDWIN GARFIELD. [1.. e]

Witnesses:

N. (3.,WILDER, JEREMY WL BLISS. 

